Booster seat



FIG. 1 is a front perspective view showing my new design for a booster seat,

FIG. 2 is another front perspective view showing a strap in an alternate position,

FIG. 3 is a top view thereof,

FIG. 4 is a bottom view thereof,

FIG. 5 is a front view thereof,

FIG. 6 is a rear view thereof,

FIG. 7 is a left side view thereof; and,

FIG. 8 is a right side view thereof. 

CLAIM The ornamental design for a booster seat, as shown and described. 